The chairman of Radnor Township’s board of commissioners has been arrested on child porn charges after graphic sexual abuse images involving babies and toddlers were allegedly found on his computers.

Philip Ahr, 66, was charged with child pornography possession and child pornography dissemination, sexual abuse of children, and criminal use of communication facility, the Delaware County District Attorney’s Office said Wednesday.

“The ages of these children is particularly disturbing. Anywhere from infants to 2-4 to 3-6, and all in those different categories,” said District Attorney Jack Whelan. “Very disturbing.”

“A portion of the images and videos depicted sadomasochistic sexual abuse, and children being sexually abused by animals,” the D.A.’s office noted in a news release issued Wednesday morning.Authorities said the investigation began in late August after they received information from the National Center for Missing and Exploited Children that Ahr uploaded and shared child pornography.